Finds the longest palindrome

Author: amit-dat

Others/longestPalindrome.java

@@ -0,0 +1,64 @@
+import java.util.HashMap;
+import java.util.Map;
+
+/**
+ * Created by Dungeoun on 10/2/16.
+ */
+public class Solution {
+
+    public static int longestPalindrome(String s) {
+
+
+        HashMap<Character, Integer> hash1 = new HashMap<>();
+
+        int length =0;
+
+
+        for(int i = 0; i<s.length(); i++){
+
+            if(hash1.containsKey(s.charAt(i))==false){
+
+                hash1.put(s.charAt(i), 1);
+
+            }
+
+            else{
+
+                hash1.put(s.charAt(i), hash1.get(s.charAt(i))+1);
+
+            }
+        }
+
+        for(Map.Entry<Character,Integer> entry: hash1.entrySet()){
+
+            if(entry.getValue()%2 == 0){
+
+                length = length + entry.getValue();
+
+            }
+            else if(entry.getValue()%2 != 0){
+
+                length = length + entry.getValue()-1;
+
+            }
+
+
+        }
+
+        if(s.length()>length) {
+
+            return length + 1;
+        }
+        else return length;
+
+    }
+
+
+    public static void main(String []args){
+
+        int l = longestPalindrome("bb");
+
+        System.out.println(l);
+
+    }
+}